Last Modified: May 22, 2026
Affected Product(s):
F5OS Velos
Fixed In:
F5OS-C 1.8.0
Opened: Oct 20, 2023 Severity: 2-Critical
On a VELOS chassis with BX520 blades, if an interface is configured for native vlan tagging (i.e. an untagged interface), small egress packets like ARP requests may be sent with a frame size smaller than the Ethernet minimum frame size of 64 bytes. Such frames are known as runts, and the peer device is likely to discard runt frames as an interface input error.
Failure to resolve MAC addresses using ARP requests.
- BX520 blade. - Native vlan configured on the interface. - Egress ARP requests (or other egress frames that are smaller than or just barely larger than the Ethernet minimum frame of 64 bytes.)
None
For frames egressing an interface on a vlan configured as a native vlan, the FPGA will add padding to the frame if its size is less than 64 bytes after the vlan tag is stripped.